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Ganymede is both the largest moon of Jupiter and the largest moon in the Solar System. With a diameter of 5268km, it is larger than Pluto and is the ninth largest object in the Solar System. Despite being such a large object, it doesn’t have a substantial atmosphere surround it. It does however have its own magnetic field, which is unique for a moon in the solar system. It is one of the Galilean moons, which were first discovered back in 1609-10. It is in a 1:2:4 orbital resonance with Europa and Io.

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